Explore topic-wise MCQs in Mechanical Engineering.

This section includes 12 Mcqs, each offering curated multiple-choice questions to sharpen your Mechanical Engineering knowledge and support exam preparation. Choose a topic below to get started.

1.

A force of 271 N is applied to the brake drum of 2 m diameter in the hand brake system as shown in the figure, where the wrapping angle is 180°. If the coefficient of friction between the drum and the band is 7/22, the braking torque applied in Nm is

A. 271
B. 100
C. 171
D. 371
Answer» D. 371
Discussion
2.

If the velocity ratio for an open belt drive is 8 and the speed of driving pulley is 800 r.p.m then considering an elastic creep of 2% the speed of the driven pulley is

A. 104.04 r.p.m
B. 102.04 r.p.m
C. 100.04 r.p.m
D. 98.04 r.p.m
Answer» E.
Discussion
3.

In a belt drive system, if T1 is the tension on the tight side, T2 is the tension on the slack side and V is the velocity of the belt, the power transmitted is _______.

A. (T2 – T1) V
B. (T1 – T2) V
C. (T1 – T2) / V
D. V/(T2 – T1)
Answer» C. (T1 – T2) / V
Discussion
4.

If the angle of wrap on a smaller pulley of diameter 250 mm is 120° and the diameter of a larger pulley is twice the diameter of the smaller pulley, then the center distance between the pulleys for an open belt drive is

A. 1000 mm
B. 750 mm
C. 500 mm
D. 250 mm
Answer» E.
Discussion
5.

If T and m represent the maximum tension and mass per unit length of a belt, then the maximum permissible speed of the belt is given by

A. \(\sqrt {\frac{T}{{3m}}} \)
B. \(\sqrt {\frac{3T}{{m}}} \)
C. \(\sqrt {\frac{2T}{{3m}}} \)
D. \(\sqrt {\frac{T}{{m}}} \)
Answer» B. \(\sqrt {\frac{3T}{{m}}} \)
Discussion
6.

In a belt drive system, when the speed of the belt increases

A. Co-efficient of friction between the belt and pulley increases
B. Co-efficient of friction between the belt and pulley decreases
C. Power transmitted will decrease
D. Power transmitted will increase
Answer» E.
Discussion
7.

Consider the following statements regarding V-belt drive :1. The groove angle of the sleeve is less than the belt section angle2. The efficiency of a V-belt drive is higher than that of a flat belt drive3. The groove angle is so made that the belt gets wedged in the groove Which of the above statements are correct ?

A. 1, 2 and 3
B. 1 and 2 only
C. 1 and 3 only
D. 2 and 3 only
Answer» D. 2 and 3 only
Discussion
8.

In a pulley and belt drive, if m is mass of belt per unit length the velocity of belt for maximum power transmission is equal to

A. \(\sqrt {\frac Tm}\)
B. \(\sqrt {\frac T{3m}}\)
C. \(\sqrt {\frac {2T}m}\)
D. \(\sqrt {\frac T{8m}}\)
Answer» C. \(\sqrt {\frac {2T}m}\)
Discussion
9.

If 'm' is the mass per unit length of belt, 'T1' is maximum allowable belt tension and 'TC' is centrifugal tension, for maximum power transmission, the velocity of the belt isa) \(\sqrt{\frac{T_1}{3m}}\)b) \(\sqrt{\frac{T_c}{m}}\)c) \(\sqrt{\frac{3T_1}{m}}\)d) \(\sqrt{\frac{m}{T_c}}\)Which of the given above is/are correct?

A. only c
B. only d
C. a and b
D. c and d
Answer» D. c and d
Discussion
10.

If the distance between the centers of two pulleys in a belt drive is 0.5 m and the diameter for the larger and smaller pulleys are 1 m and 0.5 m, respectively. The two pulleys in belt drive is connected by an open belt then the angle of contact at the smaller pulley is given by:

A. 30°
B. 120°
C. 180°
D. 60°
Answer» C. 180°
Discussion
11.

A belt drives a pulley of 200 mm diameter such that the ratio of tensions in the tight side and the slack side is 1.2, the maximum tension in the belt is not to exceed 240 kN. The speed of pulley is 60 rpm. Find the safe power transmitted by the pulley.

A. 50 kW
B. 20 kW
C. 35 kW
D. 25 kW
Answer» E.
Discussion
12.

A pulley is driven by a flat belt and the maximum tension produced in the belt is of 1400 N. The belt has the density of 1000 kg/m3, 100 mm wide and 5 mm thick. What is the speed (m/sec) of the belt for the maximum power?

A. 32
B. 31
C. 30.55
D. 3.05
Answer» D. 3.05
Discussion